[单选题]
n airplane in straight level dq6wcr;,vv -ty4 wvcvjo.) w*lso yktqv9v8n04. g)n flight experiences a lift force $L$ that is proportional to the speed of the plane and is perpendicular to the axis of the wings and as shown in diagram.
On a banked turn at the same speed, the wings make an angle $θ$ with the horizontal.
Which of the following gives the centripetal force on the airplane?
